<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Document</title>
    </head>
    <body>
        <form action="calc/sum" method="post">
            <h1>计算器</h1>
            数字1：<input name="num1" type="text"><br>
            数字2：<input name="num2" type="text"><br>
            <input type="submit" value=" 点击相加 ">
        </form>
    </body>

</html>